Acceleration of Heavy Multicharged Ions in the Interaction of a Subrelativistic Femtosecond Laser Pulse with a Melted Metal Surfaceстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Results are presented from experimental studies of ion acceleration under the action of femtosecond laser pulses with an intensity of 10(17) W/cm(2), incident onto the free surfaces of melted gallium and indium. The effect of the polarization direction of a linearly polarized laser pulse and the amplitude of a short prepulse, which precedes the main pulse by several nanoseconds, on the parameters of accelerated ions is investigated. It is found that, even for such a moderate laser intensity, the characteristic velocity of fast ions ejected along the reflected beam is a factor of 1.5 higher than that of ions ejected along the normal to the target surface. It is shown that, as the prepulse energy increases, the hard X-ray yield and the mean energy of hot electrons increase substantially, whereas the velocity of both fast and slow ions decreases appreciably regardless of laser polarization.